VoxelEngine2/src/scene/generators.rs

use super::Scene;
use super::oct_tree::{CHUNK_SIZE, OctTree};
use crate::primitives::cube::Cube;
use crate::primitives::rec_cuboid::Cuboid;
use crate::primitives::drawable::Drawable;
use crate::app_data::AppData;
use super::volumetrics::{Cone, Rect, ShapeComposition, Sphere};

extern crate rand;
use rand::Rng;

use anyhow::{Ok, Result};

use cgmath::{vec2, vec3, Vector3, Point3};

use std::cell::RefCell;
use std::rc::Rc;

use super::light::{DirectionalLight, PointLight};


pub fn generate_test_scene(scene: &mut Scene, data: &mut AppData) -> Result<(Point3<f32>)> {
    let mut rng = rand::thread_rng();
    let grid_size = CHUNK_SIZE as i32;

    let scale = 1.0;

    let mut oct_tree1: OctTree<Cube> = OctTree::create(CHUNK_SIZE, scale)?;
    let mut oct_tree2: OctTree<Cube> = OctTree::create(CHUNK_SIZE, scale)?;

    for x_index in 0..grid_size {
        for y_index in 0..grid_size {
            let shade = (rng.gen_range(0..50) as f32) / 100.0;
            let cube = Cube {
                pos: vec3(x_index as f32, y_index as f32, 5.0),
                color: vec3(shade, 1.0, shade),
                tex_coord: vec2(0.0, 0.0),
                transparent: false,
                roughness: 255,
            };

            oct_tree1.set_cube(cube.clone());

            let shade = (rng.gen_range(0..50) as f32) / 100.0;
            let cube = Cube {
                pos: vec3(x_index as f32, y_index as f32, 6.0),
                color: vec3(shade, 1.0, shade),
                tex_coord: vec2(0.0, 0.0),
                transparent: false,
                roughness: 255,
            };

            oct_tree2.set_cube(cube.clone());
        }
    }

    let shade = (rng.gen_range(0..25) as f32) / 100.0;
    let cube = Cube {
        pos: vec3(10.0, 10.0, 10.0),
        color: vec3(0.0, 0.0, 0.9),
        tex_coord: vec2(0.0, 0.0),
        transparent: true,
        roughness: 32,
    };
    oct_tree1.set_cube(cube.clone());

    let cube = Cube {
        pos: vec3(10.0, 10.0, 9.0),
        color: vec3(0.0, 0.0, 0.9),
        tex_coord: vec2(0.0, 0.0),
        transparent: true,
        roughness: 32,
    };
    oct_tree1.set_cube(cube.clone());


    let cube = Cube {
        pos: vec3(10.0, 10.0, 10.0),
        color: vec3(0.9, 0.0, 0.0),
        tex_coord: vec2(0.0, 0.0),
        transparent: true,
        roughness: 32,
    };
    oct_tree2.set_cube(cube.clone());

    let cube = Cube {
        pos: vec3(10.0, 10.0, 9.0),
        color: vec3(0.9, 0.0, 0.0),
        tex_coord: vec2(0.0, 0.0),
        transparent: true,
        roughness: 32,
    };
    oct_tree2.set_cube(cube.clone());

    scene.point_lights.push(Rc::new(RefCell::new(PointLight::init(vec3(11.0 + grid_size as f32, 11.0 + grid_size as f32, 11.0) * scale, vec3(2.0, 2.0, 2.0)))));
    scene.point_lights.push(Rc::new(RefCell::new(PointLight::init(vec3(9.0 + grid_size as f32, 9.0 + grid_size as f32, 11.0) * scale, vec3(0.5, 0.5, 0.5)))));
    scene.directional_lights.push(Rc::new(RefCell::new(DirectionalLight::init(vec3(1.0, 1.0, -1.0), vec3(0.1, 0.1, 0.1)))));

    let cube = Cuboid {
        pos: vec3(11.0 + grid_size as f32, 11.0 + grid_size as f32, 11.0) * scale,
        color: vec3(1.0, 1.0, 1.0),
        tex_coord: vec2(0.0, 0.0),
        size: Vector3 {x: 0.5, y: 0.5, z: 0.5} * scale
    };
    let index = scene.sized_vertices.len();
    cube.draw(&data.topology, index, scene);

    let cube = Cuboid {
        pos: vec3(9.0 + grid_size as f32, 9.0 + grid_size as f32, 11.0) * scale,
        color: vec3(1.0, 1.0, 1.0),
        tex_coord: vec2(0.0, 0.0),
        size: Vector3 {x: 0.5, y: 0.5, z: 0.5} * scale
    };
    let index = scene.sized_vertices.len();
    cube.draw(&data.topology, index, scene);

    let tree_ref_one = Rc::new(RefCell::new(oct_tree1.clone()));
    let tree_ref_two = Rc::new(RefCell::new(oct_tree2.clone()));
    scene.oct_trees = vec![vec![vec![tree_ref_two.clone(), tree_ref_two.clone(), tree_ref_two.clone()], vec![tree_ref_two.clone(), tree_ref_one.clone(), tree_ref_two.clone()], vec![tree_ref_two.clone(), tree_ref_two.clone(), tree_ref_two.clone()]], vec![vec![tree_ref_two.clone(), tree_ref_two.clone(), tree_ref_two.clone()], vec![tree_ref_two.clone(), tree_ref_one.clone(), tree_ref_two.clone()], vec![tree_ref_two.clone(), tree_ref_two.clone(), tree_ref_two.clone()]]];

    let mut comp = ShapeComposition::new(64);
    comp.included_shapes.push(Rc::new(RefCell::new(Sphere::new(Vector3 { x: 5.0 + grid_size as f32, y: 5.0 + grid_size as f32, z: 10.0 }, Vector3 { x: 0.0, y: 0.0, z: 0.0 }, 2.0, Vector3 { x: 0, y: 255, z: 0 }, 64, false))));
    comp.included_shapes.push(Rc::new(RefCell::new(Sphere::new(Vector3 { x: 5.0 + grid_size as f32, y: 5.0 + grid_size as f32, z: 10.0 }, Vector3 { x: 0.0, y: 0.0, z: 0.0 }, 2.5, Vector3 { x: 255, y: 0, z: 0 }, 64, false))));
    comp.excluded_shapes.push(Rc::new(RefCell::new(Sphere::new(Vector3 { x: 5.0 + grid_size as f32, y: 5.0 + grid_size as f32, z: 11.5 }, Vector3 { x: 0.0, y: 0.0, z: 0.0 }, 1.5, Vector3 { x: 0, y: 255, z: 0 }, 64, false))));    
    scene.volumetrics.push(Rc::new(RefCell::new(comp)));

    let mut comp = ShapeComposition::new(64);
    comp.included_shapes.push(Rc::new(RefCell::new(Cone::new(Vector3 { x: 20.0 + grid_size as f32, y: 5.0 + grid_size as f32, z: 10.0 }, Vector3 { x: 0.0, y: 0.0, z: 0.0 }, 0.0, 2.5, Vector3 { x: 0.0, y: 10.0, z: 0.0 },Vector3 { x: 0, y: 255, z: 0 }, 64, false))));
    comp.excluded_shapes.push(Rc::new(RefCell::new(Cone::new(Vector3 { x: 20.0 + grid_size as f32, y: 5.0 + grid_size as f32, z: 10.0 }, Vector3 { x: 0.0, y: 0.0, z: 0.0 }, 0.0, 1.5, Vector3 { x: 0.0, y: 10.0, z: 0.0 },Vector3 { x: 0, y: 255, z: 0 }, 64, false))));
    scene.volumetrics.push(Rc::new(RefCell::new(comp)));

    let mut comp = ShapeComposition::new(64);
    comp.included_shapes.push(Rc::new(RefCell::new(Rect::new(Vector3 { x: -5.0 + grid_size as f32, y: 5.0 + grid_size as f32, z: 10.0 }, Vector3 { x: 0.0, y: 0.0, z: 0.0 }, Vector3 { x: 5.0, y: 10.0, z: 2.0 },Vector3 { x: 0, y: 0, z: 255 }, 64, false))));
    comp.excluded_shapes.push(Rc::new(RefCell::new(Rect::new(Vector3 { x: -5.0 + grid_size as f32, y: 5.0 + grid_size as f32, z: 10.0 }, Vector3 { x: 0.0, y: 0.0, z: 0.0 }, Vector3 { x: 3.0, y: 8.0, z: 2.0 },Vector3 { x: 0, y: 0, z: 255 }, 64, false))));
    scene.volumetrics.push(Rc::new(RefCell::new(comp)));

    Ok((cgmath::point3(5.0, 5.0, 10.0)))
}


pub fn generate_test_scene2(scene: &mut Scene, data: &mut AppData, chunk_num_x: usize, chunk_num_y: usize, chunk_num_z: usize, num_gaussians: usize) -> Result<(Point3<f32>)> {
    let mut rng = rand::thread_rng();
    
    let scale = 1.0;

    let grid_size = CHUNK_SIZE as i32;

    let max_x = chunk_num_x * grid_size as usize;
    let max_y = chunk_num_y * grid_size as usize;
    let max_z = chunk_num_z * grid_size as usize;

    let mut height_map = vec![vec![0.0; max_y]; max_x];

    for i in 0..num_gaussians {
        let height = rng.gen_range(1..max_z / 2) as f32;
        let center_x = rng.gen_range(0..max_x) as f32;
        let center_y = rng.gen_range(0..max_y) as f32;

        let spread_x = rng.gen_range(0..max_x/2) as f32;
        let spread_y = rng.gen_range(0..max_y/2) as f32;

        for x in 0..max_x {
            for y in 0..max_y {
                height_map[x][y] += height * (-((x as f32 - center_x).powf(2.0)/(2.0 * spread_x.powf(2.0)) + (y as f32 - center_y).powf(2.0)/(2.0 * spread_y.powf(2.0)))).exp();
            }
        }
    }

    let mut oct_trees = vec![];

    for z in 0..chunk_num_z {
        oct_trees.push(vec![]);
        for y in 0..chunk_num_y {
            oct_trees[z].push(vec![]);
            for x in 0..chunk_num_x {
                oct_trees[z][y].push(Rc::new(RefCell::new(OctTree::<Cube>::create(CHUNK_SIZE, scale)?)));
            }
        }
    }

    for x in 0..max_x {
        for y in 0..max_y {
            let height = height_map[x][y].floor() as usize;
            let mut pillar_height;
            if height < max_z {
                let shade = (rng.gen_range(0..50) as f32) / 100.0;
                let cube = Cube {
                    pos: vec3((x % grid_size as usize) as f32, (y % grid_size as usize) as f32, (height % grid_size as usize) as f32),
                    color: vec3(shade, 1.0, shade),
                    tex_coord: vec2(0.0, 0.0),
                    transparent: false,
                    roughness: 255,
                };

                oct_trees[((height as f32) / (grid_size as f32)).floor() as usize][((y as f32) / (grid_size as f32)).floor() as usize][((x as f32) / (grid_size as f32)).floor() as usize].borrow_mut().set_cube(cube.clone());

                pillar_height = height;
            } else {
                pillar_height = max_z;
            }

            while pillar_height > 0 {
                pillar_height -= 1;
                let shade = (rng.gen_range(1..50) as f32) / 100.0;
                let cube = Cube {
                    pos: vec3((x % grid_size as usize) as f32, (y % grid_size as usize) as f32, (pillar_height % grid_size as usize) as f32),
                    color: vec3(shade, shade / 2.0, 0.0),
                    tex_coord: vec2(0.0, 0.0),
                    transparent: false,
                    roughness: 255,
                };

                oct_trees[((pillar_height as f32) / (grid_size as f32)).floor() as usize][((y as f32) / (grid_size as f32)).floor() as usize][((x as f32) / (grid_size as f32)).floor() as usize].borrow_mut().set_cube(cube.clone());
                
            }
        }
    }

    for i in 0..num_gaussians {
        let height = rng.gen_range(1..8) as f32;
        let center_x = rng.gen_range(0..max_x) as f32;
        let center_y = rng.gen_range(0..max_y) as f32;
        let final_height = height_map[center_x.floor() as usize][center_y.floor() as usize] + height;
        scene.point_lights.push(Rc::new(RefCell::new(PointLight::init(vec3(center_x, center_y, final_height), vec3(1.0, 1.0, 1.0)))));

        let cube = Cuboid {
            pos: vec3(center_x, center_y, final_height),
            color: vec3(1.0, 1.0, 1.0),
            tex_coord: vec2(0.0, 0.0),
            size: Vector3 {x: 0.5, y: 0.5, z: 0.5}
        };
        let index = scene.sized_vertices.len();
        cube.draw(&data.topology, index, scene);
    }

    //scene.directional_lights.push(Rc::new(RefCell::new(DirectionalLight { direction: vec3(0.5, 0.0, -1.0), color: vec3(0.1, 0.1, 0.1), memory_start: 0 })));
    scene.oct_trees = oct_trees;

    Ok(cgmath::point3((max_x as f32 / 2.0) as f32, (max_y as f32 / 2.0) as f32, height_map[(max_x as f32 / 2.0).floor() as usize][(max_y as f32 / 2.0).floor() as usize] + 2000.0))
}